We'll need to get some log files from you to troudleshoot further. Please review the Where do I find the Flash Player installation log on the Macintosh? FAQ and provide all files listed (install.log, FlashPlayerInstallManager.log, Adobe_ADM.log, and Adobe_GDE.log). Upload the files to cloud.acrobat.com/send using the instructions at How to share a document. Post the link to the uploaded files in your reply.